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    <title>Document</title>
    <script>
        //1.求1-100的累加和
        var sum = 0;
        for (var i = 1;i<=100;i++){
            sum +=i;
        }
        console.log(sum);
        //2. 求10-50的累加和
        var sum = 0;
        for (var i =10;i<=50;i++){
            sum +=i;
        }
        console.log(sum);
        //3.函数:封装了一段可以被重复执行调用的代码块  目的：让大量代码重复使用
        function getSum(num1,num2) {
            var sum = 0;
            for (var i = num1;i<=num2;i++){
                sum+=i;
            }
            console.log(sum);
        }
        getSum(1,100);
        getSum(10,50);
    </script>
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